Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

cannonfield.cpp Example File
tutorial/t10/cannonfield.cpp

/****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** Licensees holding valid Qt Preview licenses may use this file in
** accordance with the Qt Preview License Agreement provided with the
** Software.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
** information about Qt Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#include <QPaintEvent>
#include <QPainter>

#include "cannonfield.h"

CannonField::CannonField(QWidget *parent)
    : QWidget(parent)
{
    currentAngle = 45;
    currentForce = 0;
    setPalette(QPalette(QColor(250, 250, 200)));
    setAutoFillBackground(true);
}

void CannonField::setAngle(int angle)
{
    if (angle < 5)
        angle = 5;
    if (angle > 70)
        angle = 70;
    if (currentAngle == angle)
        return;
    currentAngle = angle;
    update(cannonRect());
    emit angleChanged(currentAngle);
}

void CannonField::setForce(int force)
{
    if (force < 0)
        force = 0;
    if (currentForce == force)
        return;
    currentForce = force;
    emit forceChanged(currentForce);
}

void CannonField::paintEvent(QPaintEvent * /* event */)
{
    QPainter painter(this);

    painter.setPen(Qt::NoPen);
    painter.setBrush(Qt::blue);

    painter.translate(0, height());
    painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16);
    painter.rotate(-currentAngle);
    painter.drawRect(QRect(30, -5, 20, 10));
}

QRect CannonField::cannonRect() const
{
    QRect result(0, 0, 50, 50);
    result.moveBottomLeft(rect().bottomLeft());
    return result;
}


Copyright © 2006 Trolltech Trademarks
Qt 4.2.0-rc1